I have 2 hardy kiwi about 8-10" long. While I want to plant them in pots and have them sprawl across a porch railing, we are not yet free from possibility of frost. How well do shoots stand up to frost...any ability?

Edit: The problem with hardy kiwis isn't how cold hardy the plant is, but more that they evolved in climates with more predictable temperature transitions than experienced in North America. Some species of kiwi tolerate Siberian winters, but will not tolerate cold snaps in spring in Southern Canada or the US North East.